I want to offer a suggestion for the User Interface. Mainly due to the requirements to have to select the 'Import' option twice - at least that's how it feels. I understand you have to declare what each item is and then click the button again to actually import the item. However, this can be confusing and doesn't really give enough info either. So, I decided to play with it a tad with a layout I think would help.

The first thing I did was move the import of the list buttons to the top of the Scene Import, which makes move sense due to the fact that people work top down. Second, I moved the 'Import' buttons to each item. Basically you declare each item via a dropdown box for each item and click the button next to it to import it. On top of that, unless you declare what the item is, the import button is grey and unclickable. Once you declare the item, then the button becomes active. Also, once the item is imported, the button goes inactive, but shows the process for that item to be complete. You could make it active and allow a re-import option, but it needs to show that it's already been imported. I also suggest to have a spinner or some other such type of device to allow the user to know the app is working. It's too easy to think it's stalled and you want to click the button again.

This is just a suggestion. I had time on my hands.